New CEO Opens Window on Microsoft's Future

Investors have laid out the welcome mat for Microsoft's new chief. But Satya Nadella will need to strike a delicate balance lest the rug is pulled out from under him.

So far, he is off to a good start. Mr. Nadella made his first public showing at a small press event in San Francisco last week to launch the company's popular Office suite for Apple's iPad. He also announced new services designed to help companies manage fleets of...